渤海典型稠油油藏稠油高黏微观机理研究

Study on Microscopic Mechanism of Heavy Oil High Viscosity in Typical Heavy Oil Reservoirs in Bohai Sea

刘进祥 李哲 郝敬滨 葛嵩 王秋霞 郑伟 卢祥国 杨建宏

Jinxiang LIU Zhe LI Jingbin HAO Song GE Qiuxia WANG Wei ZHENG Xiangguo LU Jianhong YANG

东北石油大学 提高油气采收率教育部重点实验室，黑龙江 大庆 163318 海洋石油高效开发国家重点实验室，北京 100028 中海石油（中国）有限公司 湛江分公司，广东 湛江 524057 中海石油（中国）有限公司天津分公司 渤海石油研究院，天津 300452 中海油研究总院有限责任公司，北京 100028 中海油能源发展有限公司 工程技术分公司，天津 300450

Key Laboratory of Enhanced Oil and Gas Recovery of Ministry of Education，Northeast Petroleum University，Daqing Heilongjiang 163318，China State Key Laboratory for Efficient Development of Offshore Oil，Beijing 100028，China Zhanjiang Branch，CNOOC（China） Co. ，Ltd. ，Zhanjiang Guangdong 524057，China Tianjin Branch Bohai Petroleum Research Institute，CNOOC（China）Co. ，Ltd. ，Tianjin 300452，China CNOOC Research Institute Co. ，Ltd. ，Beijing 100028，China Engineering Branch，CNOOC Energy Development Co. ，Ltd. ，Tianjin 300450，China

稠油微观高黏机理研究对高效开发渤海稠油具有重要意义。针对渤海典型稠油油藏，通过开展原油黏度与温度关系、原油组分和组分极性、杂原子分布和沥青质聚集体结构等研究，探讨了稠油高黏微观机理。结果表明，与渤海N油田（胶质、沥青质质量分数分别为23.25%和6.59%）相比，L油田中饱和烃、芳香烃质量分数较低，胶质、沥青质质量分数（分别为29.95%和9.76%）较高；O、N、S等杂原子质量分数较高，胶质和沥青质相对分子质量也较大，各组分分子的极性较强，胶质和沥青质偶极矩分别达到14.01、17.94 D（N油田的胶质和沥青质偶极矩分别为9.12、12.25 D）。以上均会导致胶质、沥青质分子间的作用力较强，分子间缔合作用明显增强，沥青质分子间距更小，聚集体结构更加致密，最终导致原油黏度较高。

The study of the micro high viscosity mechanism of heavy oil is of great significance for the efficient development of Bohai heavy oil. Therefore, aiming at the typical heavy oil reservoirs in Bohai Sea, the microscopic mechanism of high viscosity of heavy oil is analyzed and studied from the aspects of viscosity?temperature relationship, crude oil composition and component polarity, heteroatom distribution and asphaltene aggregate structure. The results show that compared with N oilfield in Bohai Sea, the content of alkanes and aromatics in L oilfield in Bohai Sea is lower, and the quality score of resins and asphaltenes is higher, reaching 29.95% and 9.76% (23.25% and 6.59% in N oilfield). The quality score of heteroatoms such as O,N and S are high, and the relative molecular mass of resins and asphaltenes are also high. The polarity of each component is strong, and the dipole moments of resins and asphaltenes reach 14.01 D and 17.94 D, respectively (9.12 D and 12.25 D in N oilfield ). These will lead to stronger intermolecular forces and stronger intermolecular association between resins and asphaltenes. The smaller asphaltene molecular spacing and the denser aggregate structure,which will eventually lead to higher viscosity of crude oil.

第五批“海洋石油高效开发国家重点实验室开放基金课题”资助项目(CCL2021RCPS0517KQN)

10.12422/j.issn.1672-6952.2024.06.009